| 摘要 |
PROBLEM TO BE SOLVED: To improve the friction wear characteristics of a friction material to be used in the brake equipment of automobiles. SOLUTION: In the friction material obtained by integrally molding a base material component with a thermosetting resin, the base material component contains composite titanium compound powder composed of composite crystal particles in which crystal grains of an alkaline earth metal titanate of the formula: RTiO3 (wherein R is Mg, Ca, Sr or Ba) are linked with crystal grains of an octotitanate of the formula: AXMYTi8-YO16 (wherein A is an alkali metal element or Ba; M is Al, Fe, Cr, Ga, Mg, Co, Ni, Cu or Zn; X=0.5-3; and Y=X/2 when M is a divalent element or Y=X when M is a trivalent element). As the crystalline phase constitution of the composite crystal particles, the ratio (molar ratio) of the crystals of the alkaline earth metal titanate to those of the octotitanate salt is preferably 1/0.1 to 1/0.2, and the particle diameter is preferably in the range of 10 to 100μm. The friction material stably retains a high coefficient of friction and, simultaneously, exhibits frictional wear characteristics excellent in high wear resistance and facing damage as the effects of the particle structure in which the two crystalline phases are linked with each other.
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